Severe outbreaks of Alternaria leaf spot have occurred in Northern Italy on leafy vegetable and ornamental hosts. This disease is mainly controlled by two classes of respiration inhibitor fungicides. QoIs (including azoxystrobin) and SDHIs (including boscalid). Thirty-six Alternaria strains were isolated from five leafy vegetable crops. https://www.roneverhart.com/RKT-9-RDO/